Declassified Intelligence - Mature Doppelganger

According to the documentation provided by the General Investigation Bureau, the typical development of ordinary impostors proceeds as follows:

1. "Disguise":
Counting from the initial formation of the mental corner, the individual maintains their original persona and lifestyle while normally passing psychological screenings administered by human society.
The more natural the disguise process, the more humans can be deceived, and the greater the recognition gained from the corner.

2. "Desire Venting":
From the moment the mental corner is generated, the individual hears whispers from the corner every day. These whispers will stir up the individual's suppressed desires and obsessions, amplifying them continuously over time.
This includes, but is not limited to, violent brawls, exhibitionism, theft, and even murder.
While maintaining the facade of disguise, the greater the degree of desire venting and the larger the impact, the more recognition is gained from the corner.

*There are also a few exceptional individuals who, even while merely maintaining their disguise, are effectively venting their desires. Some are even unaffected by the whispers, capable of perceiving the corner in their own way and instead exerting reverse dominance over the mental corner.

When maintaining a surface-level normal disguise and private desire venting continues for more than a year, the impostor at this stage approaches or achieves [Maturity].

A mature impostor possesses the following characteristics:

1. "Complete Manifestation of Terror": Capable of undergoing full-body transformations, presenting the most perfected image of terror within the limits recognized by the brain and tolerated by the flesh.
2. "Flesh and Blood Corner": The once ethereal mental corner can manifest visually on the surface of the pituitary gland, or even across the entire face, which can be used to influence their most familiar area and form a corner-like space.
*A mature pituitary gland holds extremely high value.
3. "Eligibility": When the time is ripe, the individual will receive a special notice from the corner, acquiring the formal eligibility to travel to the corner through the method of ████.

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